Wedge-joint.



Patented Nov. I8. |902.

E. PFEIL, GEBUBEN BREUSI. W. H. SCHNEIDER.

W E D G E J 0 l N T (Application led Mar. 20, 1902A (No Model.)

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IIEn Sra'rns nrnnr @Erica EMILIE PFEIL, GEBOREN BREUS'IOF BERLIN, ANDWILHELM HEINRICH SCHNEIDER, OF IILMERSDORR GERMANY.

WEDGE-JOlNT.

SFECIFICATION forming part of Letters Patent No. 713,679, dated November18, 1902. Application tiled March 20, 1902. Serial No. 99,142. (Nomodel.)

T0 all wtmn 7175 may concern:

Be it. known that we, EMILIE PEEIL, geboren BREUST, of 4c, Strasse 4a,Berlin, and WILHELM HEINRICH SCHNEIDER, merchant, of 9l\Ieierottostrasse, Vilmersdorf, near Berlin, Germany, subjects of theEmperor of Germany,have invented a new and useful Vedge- Joint, of whichthefollowing is a specification.

Our invention comprises a new wedge or tenon joint which may be employedfor wedging together pieces of wood, iron, stone, or the like which areto be joined to each other.

The principal feature of this invention consists of using as a tenon orwedge a connecte ing-piece, the crosssection of which has its middleportion diminished-as, for instance, a I-iron or double dovetailedprismatical piece, which tenon-piece has an oblique position to thejoint-plane and enters both the pieces to be jointed within suitablegrooves adapted to its cross-section.

The accompanying drawings illustrate the invention when employed forwoodenware.

Figures 1 and 2 show in front elevation and in section, respectively,the connection ot' a table-frame to the leg; Fig. 3, gives a plan Viewthereof on a larger scale; Fig. 4 a modiiication in plan view on thesame scale. Fig. 5 shows the connection partly loosened. Fig. Gillustrates a stool with our improved tenon-joint; Fig. 7, the plan viewthereof;

Fig. 8, the side elevation, partly in section.

Fig. 9 shows the connection between the seat, the panels, and the leginserted therein.

In Figs. l to 5, a is the table-frame, and b the upper portion of thetable-leg. The joint-piece is herein formed by an I-iron c, which entersboth the pieces a and l) within correspondiugly-shaped grooves d d',respectively, so as to have a position obliquely to the joint-planebetween the said pieces a and l). The wedge-shaped side surfaces of thesaid grooves CZ CZ'v are .pressed firmly against each other and betweenthe flanges ofthe said I-iron c. Thus a very firm connection of the twopieces is obtained by this wedging. In the modified form of constructionillustrated in Fig. 4 a double dovetailed prismatic piece, made of hardwood, is substituted for the I- iron c. In the arrangement shown in Fig.5 the joint is partlyloosened, and the j oint-surfaces e andf have stilla small distance from each other.

In the construction of a stool shown in Figs. G to 9 we use theusual'seat consisting of two boards g and h, the cross-pieces fi and 7nfor uniting said seat-boards, and the four legs Z, entering saidcrosspieces with their upper ends, as all this is well known in theconstruction of such like stools. For firmly connecting the said partswith each other we use four connecting-irons m, the cross-section ofwhich forms a double dovetail, (see Figs. 6 and 9,) and we arrange thegrooves for receiving said irons in such a manner that the irons whenplaced therein are inclined besides to the joint-plane n also to thedirection of the grain for preventing splintering of the edges ofsaidgrooves. Further, we arrange the grooves in the cross-pieces i and 7o ina flat V form, as shown in Fig. 7, and we use four single irons m forconnecting` the parts with each other. It will be clear that the obliquegrooves in the cross-pieces't' and 7i; also penetrate the upper ends ofthe legs Z within said crosspieces, and by this means, Figs. 8 and 9,the said legs are firmly secured in position. Itis obvious that in thisconstruction of a stool each drying of the wood contrary to theconstruction heretofore used eiects further tightening of theconnection, as the end of the leg which is contracted by drying embracesthe iron m faster and faster, and by reason of the V form of the obliquegrooves the seat-boards are firmly pressed against each other, and theconnection is more and more tightened when the seat-boards and thecross-pieces are contracted by drying.

Having now described our invention, We claiml. In a wedge or tenon jointthe combination with two work-pieces to be joined of a prismaticalconnecting-piece, the cross-section of which has its middle portiondiminished, and grooves corresponding in crosssection to saidconnecting-piece and so arranged that the said piece enters both thework-pieces so that its longitudinal axis is inclined to thejoint-plane, substantially as and for the purpose specified.

2. In a wedge or tenon joint, the combination with two work-pieces to bejointed of an .zo plane, substantially as set forth.

Il. In a wedge or tencn jointthe combination with two work-pieces to bejoined of a third work-piece entering one of said two work-pieces, aniron having a double dovetailed cross-section and inclined grooves for Isaid iron penetrating the three work-pieces, substantially as described.

EMILIE- PFEIL, (tlm.) BREUST. .WILIIIELM HEINRICH SCHNEIDER. Witnesses:

WOLDEMAR HAUPT, WILLIAM MAYNER.

